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OwnedResultStream

Struct OwnedResultStream 

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pub struct OwnedResultStream { /* private fields */ }
Expand description

Binding-friendly result stream with no lifetime parameter.

Used by language bindings (Python, Node.js, WASM) where Rust lifetimes cannot be expressed at the FFI boundary. The operator tree is 'static because operators hold Arc<dyn GraphStoreSearch> rather than borrows; the stores remain alive as long as the stream does.

Callers that need to tie the stream’s lifetime to something else (e.g. a wrapping Arc<RwLock<GrafeoDB>> in a binding) should carry that keepalive in their own wrapper alongside the stream.

§Stability: Experimental

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impl OwnedResultStream

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pub fn columns(&self) -> &[String]

Column names in the order they appear in each row.

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pub fn column_types(&self) -> &[LogicalType]

Column types. Initially Any; refined after the first non-empty chunk.

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pub fn next_chunk(&mut self) -> Result<Option<DataChunk>>

Pulls the next chunk. See ResultStream::next_chunk.

§Errors

Propagates operator errors and deadline timeouts.

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pub fn into_row_iter(self) -> OwnedRowIterator

Converts to a row iterator that buffers one chunk internally.

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pub fn collect(self) -> Result<QueryResult>

Drains into a QueryResult.

§Errors

Propagates operator errors and deadline timeouts.

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impl Debug for OwnedResultStream

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fn fmt(&self, f: &mut Formatter<'_>) -> Result

Formats the value using the given formatter. Read more

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Blanket Implementations§

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impl<T> Any for T
where T: 'static + ?Sized,

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fn type_id(&self) -> TypeId

Gets the TypeId of self. Read more
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impl<T> Borrow<T> for T
where T: ?Sized,

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fn borrow(&self) -> &T

Immutably borrows from an owned value. Read more
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impl<T> BorrowMut<T> for T
where T: ?Sized,

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fn borrow_mut(&mut self) -> &mut T

Mutably borrows from an owned value. Read more
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impl<T> From<T> for T

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fn from(t: T) -> T

Returns the argument unchanged.

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impl<T, U> Into<U> for T
where U: From<T>,

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fn into(self) -> U

Calls U::from(self).

That is, this conversion is whatever the implementation of From<T> for U chooses to do.

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impl<T> IntoEither for T

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fn into_either(self, into_left: bool) -> Either<Self, Self>

Converts self into a Left variant of Either<Self, Self> if into_left is true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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fn into_either_with<F>(self, into_left: F) -> Either<Self, Self>
where F: FnOnce(&Self) -> bool,

Converts self into a Left variant of Either<Self, Self> if into_left(&self) returns true. Converts self into a Right variant of Either<Self, Self> otherwise. Read more
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impl<T> Pointable for T

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const ALIGN: usize

The alignment of pointer.
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type Init = T

The type for initializers.
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unsafe fn init(init: <T as Pointable>::Init) -> usize

Initializes a with the given initializer. Read more
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unsafe fn deref<'a>(ptr: usize) -> &'a T

Dereferences the given pointer. Read more
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unsafe fn deref_mut<'a>(ptr: usize) -> &'a mut T

Mutably dereferences the given pointer. Read more
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unsafe fn drop(ptr: usize)

Drops the object pointed to by the given pointer. Read more
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impl<T, U> TryFrom<U> for T
where U: Into<T>,

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type Error = Infallible

The type returned in the event of a conversion error.
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fn try_from(value: U) -> Result<T, <T as TryFrom<U>>::Error>

Performs the conversion.
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impl<T, U> TryInto<U> for T
where U: TryFrom<T>,

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type Error = <U as TryFrom<T>>::Error

The type returned in the event of a conversion error.
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fn try_into(self) -> Result<U, <U as TryFrom<T>>::Error>

Performs the conversion.